docs: add Android/Jetpack Compose v0.9 renderer to ecosystem

[TanXudong-Vivo]

Description

Adding TanXudong-Vivo/A2UI-Android-Renderer to the community renderers list.

• Platform: Android (Jetpack Compose + Material 3)
• Protocol: A2UI v0.9
• 13 fully implemented components + 5 placeholders
• Streaming rendering support
• Data binding (path expressions + formatDate)
• Custom Catalog extension support
• Live demo: restaurant_finder ADK agent

Pre-launch Checklist

• I signed the CLA.
• I read the Contributors Guide.
• I read the Style Guide.
• I have added updates to the CHANGELOG.
• I updated/added relevant documentation.
• My code changes (if any) have tests.
• If my branch is on fork, I have verified that scripts/e2e_test.sh passes.

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[google-cla]

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For the most up to date status, view the checks section at the bottom of the pull request.

[gemini-code-assist]

Code Review

This pull request adds the TanXudong-Vivo/A2UI-Android-Renderer to the ecosystem documentation, including a new entry in the renderers table and a detailed description. The review feedback focuses on maintaining consistent Markdown formatting according to the style guide and refining the project description to highlight its v0.9 protocol support. Additionally, the reviewer pointed out that the PR description is missing the required Pre-Review Checklist and that an existing claim in the documentation regarding Jetpack Compose renderers is now outdated and requires an update.